Macbook Pro grey startup screen failure

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Aug 1, 2012
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Here is my situation. My macbook pro froze so I restarted it and ended up with the grey startup screen with OS X not loading. I have already reset the nvram and safe boot with no success. Also I tried restarting from the OS X disc and I cannot repair the disk or even erase my hardrive for a fresh install. During disk repair and disk erase it will say it cannot unmount the disk and after a few minutes of trying to reinstall OS X again it errors. Is there something I'm missing or is it a possible hardware problem? Any help is much appreciated, thanks.
 
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The sound wont work .):

Sorry if this is in the wrong section.. i'm new to these forums .
Ok so my volume on my mac isnt working . When I press the lower and higher volume it pops up but it wont do anything . It just has this wierd circle symbol with a side dash in the middle . Please help ! Also , when I turned it on it took forever to start up ..
 
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Various Mac's
Here is my situation. My macbook pro froze so I restarted it and ended up with the grey startup screen with OS X not loading. I have already reset the nvram and safe boot with no success. Also I tried restarting from the OS X disc and I cannot repair the disk or even erase my hardrive for a fresh install. During disk repair and disk erase it will say it cannot unmount the disk and after a few minutes of trying to reinstall OS X again it errors. Is there something I'm missing or is it a possible hardware problem? Any help is much appreciated, thanks.

From your description it's more likely your hard drive has failed. What MacBook Pro do you have?
 

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